When is (m+1)/(m-1) an integer?
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Original post by NoNewFriends
Is the explanation n+1|n-1 implies n+1 <= n-1 which doesn't make sense as n is positive integer?
Yes that's basically correct. Although x|y implies x<=y isn't true for all x and y
e.g. 2 | -4 but 2>-4
But it's true in your case because you're dealing with positive integers.
Original post by notnek
Yes that's basically correct. Although x|y implies x<=y isn't true for all x and y
e.g. 2 | -4 but 2>-4
But it's true in your case because you're dealing with positive integers.
e.g. 2 | -4 but 2>-4
But it's true in your case because you're dealing with positive integers.
The very original problem was finding all positive integers n such that n+1|n^2+1 (done now).
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